15. The uniform surface charge density on an infinitely long strip of finite width 2a is σ. Calculate the electric field at a distance b from the center of the metallic plane, as the point P in Fig. 1. (A) (B) (C) (D) (E)none of the above.

複選題3. Which of the following is correct?(A) Given physical quantities A and B of the same dimension (e.g. they are both the lengths of something), and quantities C and D of the same dimension, if D is uniquely determined by A, B, and C, there must be some num nerical constants k and n (of no dimension) such that D = kC(A/B)n. (B) The moon is orbiting around the earth with roughly the samne period as that for its spinning around its own axis. (C) The gravitational potential energy for N point masses is the distance between particle i and particle j, and G is the Newton constant. (D) As the kinetic energy is given by a diffcrent formula, the total energy of an isolated system is not conserved in special relativity. (E) The friction is a conservative force. GMMI

15. The uniform surface charge density on an infinitely long strip of finite width 2a is σ. Calculate the electric field at a distance b from the center of the metallic plane, as the point P in Fig. 1.

(A)
(B)
(C)
(D)
(E)none of the above.

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